Hi Raj Sharma,
Thank you for writing. Please do not mix standard OLE drag & drop method calls with the automatic drag & drop that RadTreeView provides. The DoDragDrop() method is a .NET method (not provided by Telerik) and is not guaranteed to work with Telerik controls in all cases. When you call DoDragDrop(), the method installs a modal message loop which handles all WM_MOUSEMOVE events and none get to RadTreeView, this is why you have no line.
The OLE Drag & Drop events, methods and properties, which are members of Control are:
RadTreeView drag & drop events and properties are:
Please choose which mechanism you will use and use it consistently. Write again if you have other questions.
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